Superconductivity in infinite-layer nickelate La_1-xCa_xNiO₂ thin films.

ABSTRACT: We report the observation of superconductivity in infinite-layer Ca-doped LaNiO₂ (La_1-xCa_xNiO₂) thin films and construct their phase diagram. Unlike the metal-insulator transition in Nd- and Pr-based nickelates, the undoped and underdoped La_1-xCa_xNiO₂ thin films are entirely insulating from 300 K down to 2 K. A superconducting dome is observed at 0.15 < x < 0.3 with weakly insulating behavior at the overdoped regime. Moreover, the sign of the Hall coefficient R_H changes at low temperature for samples with a higher doping level. However, distinct from the Nd- and Pr-based nickelates, the R_H-sign-change temperature remains at around 35 K as the d

SUBMITTER: Zeng S 

PROVIDER: S-EPMC8856608 | biostudies-literature | 2022 Feb

REPOSITORIES: biostudies-literature